V-Ray Tip: Consistent V-Ray ACES/OCIO LUT Workflow

Consistency with LUTs across render, review, and comp prevents color surprises and re-renders. Here is a practical, ACES/OCIO-friendly approach for V-Ray that scales from look-dev to final delivery. For licensing and expert guidance, consider NOVEDGE.

• Establish one color pipeline:
  • Pick a single OCIO configuration for the project (e.g., ACES 1.2/1.3).
  • Set rendering/working space to ACEScg in your DCC where applicable; leave data maps (normal/roughness/etc.) as Raw/Linear.
  • Centralize the OCIO config.ocio on a shared path so DCCs, VFB, and compositing apps reference the same file.
• Configure V-Ray VFB for correct viewing:
  • In the VFB Color Management, choose OCIO and select your Display and View (e.g., Display: sRGB, View: ACES 1.0 Output – sRGB).
  • Use the VFB Exposure/White Balance for technical adjustments; keep creative intent inside a dedicated LUT layer.
  • When saving finals, decide explicitly: bake color corrections (client previews) or save raw linear EXR (comp). Don’t do both.
• Place creative LUTs intentionally:
  • Use a LUT layer in the VFB to preview show looks. Keep it versioned and named (e.g., showLook_v04.cube).
  • In ACES, “Look” usually sits in the display pipeline. Match the LUT’s expected space (pre- or post-view). If uncertain, apply the LUT in comp where you can control transform order explicitly.
  • Avoid stacking multiple looks. One approved creative LUT per shot/sequence keeps grading predictable.
• Export for compositing cleanly:
  • Render 32‑bit EXR in ACEScg, no display transform or LUT baked. Include needed raw AOVs (lighting, GI, spec, emission, cryptomatte).
  • In Nuke/AE with OCIO, set Read nodes to ACEScg, apply the same View/Display, then apply the identical creative LUT.
  • Deliver review outputs (JPEG/MP4) with the display transform and the creative LUT baked to match what you saw in the VFB.
• Avoid common pitfalls:
  • No double transforms: never apply sRGB correction over an ACES view already converting to sRGB.
  • Separate technical from creative steps: exposure/white balance first, LUT second.
  • Check texture color spaces—albedo in sRGB, data maps Raw—mismatches create non-linear looks a LUT can’t fix.
• Standardize and share:
  • Save VFB color corrections presets and LUT choices per show; store alongside scene or in version control.
  • Document the OCIO config version, chosen Display/View, LUT filename, and delivery color space in the shot notes.
  • QC with a calibrated display (use your OS/ICC profile in VFB if needed) and a reference color chart render.

This alignment keeps previews, dailies, and finals visually identical, minimizes rework, and ensures your EXRs remain future‑proof. Need help selecting the right V-Ray edition or upgrading your pipeline? Visit NOVEDGE for personalized support and licensing options.